Chlapik, a forward from the Czech Republic, got his initial taste of the NHL in 2017-18, playing 20 games for the Ottawa Senators in his first pro season after being selected in the second round (No. 48) of the 2015 NHL Draft. He made his NHL debut on Oct. 26, 2017, getting an assist in a 5-4 victory against the Philadelphia Flyers. Chlapik scored his first NHL goal in a 6-2 loss to the Edmonton Oilers on March 22, 2018.
Chlapik also had 32 points (11 goals, 21 assists) in 52 games for Belleville, Ottawa's affiliate in the American Hockey League.